Investigating potential power current sources capable of handling both AC and DC currents using the LM317 current source.

A current source provides electrical energy with a constant current. The implication is that if the resistance of the load changes the current source will vary the voltage to compensate.

Another 1A, 20V PWM DAC current source, but this time it uses boost preregulator that can run from a 5V regulated or unregulated supply.